This species occurs over a wide area of northwest Montana, where it grows on open talus, bedrock and scree. It may over time be vulnerable to displacement by Centaurea maculosa or losses from herbicide spray and drift. Lomatium dissectum is currently not rare, but its status should be reviewed periodically (each 10 years?).

Lomatium dissectum should not easily be confused with other Lomatium species in Montana. It could be mistaken with Ligusticum filicinum or L. tenuifolium, which tend to grow in more mesic habitats. Lomatium dissectum has either yellow or purplish flowers while Ligusticum flowers are white.

Species Range

Present

Range Comments

Lomatium dissectum var. dissectum occurs in, and west of, the Cascade Range and in northern Idaho. Variety multifidum occurs in south British Columbia and to northern Wyoming, central Idaho and central Oregon and less commonly to northern Nevada and southern Idaho. It has also been reported to occur through California to Baja California (Hickman, 1993). Variety eatonii occurs from southern Wyoming, southern Idaho and central and northeastern Oregon, Colorado, Nevada and southern California (Cronquist et al, 1997). A distribution map for Lomatium dissectum is provided on the internet (see citation list).